"""

多个线程共享数据 - 有锁的情况

Version: 0.1
Author: 骆昊
Date: 2018-03-20

"""

import time
import threading


class Account(object):

	def __init__(self):
		self._balance = 0
		self._lock = threading.Lock()

	def deposit(self, money):
		# 获得锁后代码才能继续执行
		self._lock.acquire()
		try:
			new_balance = self._balance + money
			time.sleep(0.01)
			self._balance = new_balance
		finally:
			# 操作完成后一定要记着释放锁
			self._lock.release()

	@property
	def balance(self):
		return self._balance


if __name__ == '__main__':
	account = Account()
	# 创建100个存款的线程向同一个账户中存钱
	for _ in range(100):
		threading.Thread(target=account.deposit, args=(1,)).start()
	# 等所有存款的线程都执行完毕
	time.sleep(2)
	print('账户余额为: ￥%d元' % account.balance)

# 想一想结果为什么不是我们期望的100元
